例如，可以使用跟踪条来控制系统的鼠标速度或光标闪烁频率。

For example, you might use the track bar to control the cursor blink rate or mouse speed for a system.

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鼠标是一个必要的外部设备，它可以使用户以比仅使用键盘快得多的速度完成许多操作。

A mouse is essentially a pointing device that allows the user to do many operations more quickly than he could with the keyboard alone.

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参考运行速度注意事项一节，了解将鼠标坐标转换为网格其背后的思想。

Consult the "Speed considerations" section for the ideas behind transforming mouse coordinates into a grid.

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